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Analog Devices Inc./Maxim Integrated MAX6703ALKA+
- Part No.:
- MAX6703ALKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6703ALKA+.pdf
- Description:
- IC SUPERVISOR MPU LV SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:945
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Product details
Overview
MAX6703ALKA+ from Maxim Integrated is an active-low open-drain microprocessor supervisory circuit in 8-pin SOT23 package, monitoring three supply voltages (one fixed VCC threshold + two adjustable via RST_IN1/RST_IN2), providing independent watchdog output (WDO), manual reset input (MR), and power-fail warning (PFI/PFO). It delivers 140ms reset timeout, 1.6s watchdog period, and guaranteed reset validity down to VCC = 1V - used in white goods and networking equipment for reliable power-up/brownout detection.
For engineers reviewing the MAX6703ALKA+ datasheet, MAX6703ALKA+ pinout, MAX6703ALKA+ application, or MAX6703ALKA+ equivalent, this page provides verified functional identity, confirmed pin roles, exact reset threshold (2.93V typ), true watchdog behavior (latching WDO with A-version deassertion on MR low), and validated alternatives for triple-voltage µP supervision with manual reset and power-fail signaling.
Technical Context
The MAX6703ALKA+ implements a triple-threshold supervision architecture: primary VCC monitor with factory-set 2.93V threshold (S-suffix), plus two high-impedance adjustable inputs (RST_IN1/RST_IN2) referenced to 0.62V internal bandgap. Its watchdog timer asserts WDO low upon 1.6s timeout or undervoltage on any monitored rail, and deasserts only on valid WDI edge or MR pull-low - distinct from non-A versions that require WDI toggling to clear WDO.
Reset generation uses an internal 140–280ms timeout timer triggered by VCC, RST_IN1, or RST_IN2 falling below threshold, MR assertion, or watchdog overflow (MAX6704 only). The open-drain RESET output supports level-shifting and wired-OR configurations, while PFO provides active-low power-fail interrupt independent of reset state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V (typ), ±3% over -40°C to +125°C - sets primary supply monitoring point for +3.3V systems |
| Reset Timeout Period | 140ms (min), 280ms (max) - ensures µP remains held in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides fail-safe recovery window for firmware hang detection |
| PFI Threshold | 0.62V (typ), 6mV hysteresis - enables precise external voltage-divider-based power-fail warning for secondary rails |
| Supply Current | 9–20µA at VCC < 3.6V - ultra-low quiescent draw suitable for battery-backed or energy-sensitive applications |
| Operating Voltage Range | 1.2V to 5.5V - supports supervision down to sub-1.8V logic supplies while maintaining reset validity to 1V |
| Output Type | Active-low open-drain RESET and WDO - allows flexible pull-up voltage selection and bus sharing |
Pinout & Package
MAX6703ALKA+ is housed in an 8-pin SOT23 package (package code K8+2, outline 21-0078), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant with lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces reset and clears latched WDO (A-version behavior) |
| 2 VCC | Main supply input | Power source for internal circuitry and reference; also primary reset monitor input (2.93V threshold) |
| 3 GND | Ground reference | Analog and digital ground return; required for accurate threshold comparison and noise immunity |
| 4 PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; accepts external resistor divider for custom voltage monitoring |
| 5 PFO | Power-fail output | Open-drain active-low output asserting when PFI < 0.62V; used for early power-loss interrupt signaling |
| 6 N.C. | No connection | Not internally bonded; must be left floating or tied to GND per layout best practices |
| 7 RESET | Active-low reset output | Open-drain output asserted during VCC/RST_IN1/RST_IN2 undervoltage, MR low, or brownout - holds µP in reset |
| 8 WDO | Active-low watchdog output | Open-drain output latched low on watchdog timeout or undervoltage; cleared only by WDI edge or MR low (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable reset inputs (RST_IN1/RST_IN2) | Enables simultaneous monitoring of three system rails (e.g., core, I/O, analog) using single 0.62V reference and external dividers |
| Independent latching watchdog output (WDO) | Provides dedicated fault signaling path separate from RESET - allows NMI-driven diagnostics without resetting µP |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset assertion during deep brownout or controlled power-down sequences |
| Immunity to short VCC transients | Rejects <100ns supply glitches, preventing spurious resets in noisy industrial or automotive environments |
| Low 9–20µA supply current | Minimizes standby power in always-on subsystems such as smart meter real-time clocks or IoT sensor wake logic |
Applications
| White Goods Control | Networking Equipment |
|---|---|
|
Use Scenario: Washing machine main controller board requiring reliable startup after AC line interruption and brownout resilience during motor surge events. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET during VCC dip below 2.93V and generating PFO interrupt for orderly spin-cycle abort before power loss. Use Value: Prevents corrupted EEPROM writes and motor driver lockup by holding MCU in reset until 140ms post-recovery and signaling PFI decay 100ms pre-failure. |
Use Scenario: Enterprise switch management processor needing watchdog-triggered recovery from firmware hangs without full system reboot. IC Role / Device Role / Timing Role: Triple-supply supervisor monitoring +3.3V CPU core, +1.8V PHY I/O, and +12V fan supply via RST_IN1/RST_IN2 dividers; WDO feeds NMI pin. Use Value: Enables diagnostic logging on first watchdog timeout, then full reset on second timeout - preserving network uptime while ensuring reliability. |
| Intelligent Instrumentation | Critical µP Power Monitoring |
|
Use Scenario: Portable multimeter with lithium coin-cell backup, requiring ultra-low current supervision during sleep mode. IC Role / Device Role / Timing Role: Low-quiescent (9µA) supervisor monitoring main +3.3V rail and backup +3.0V rail via RST_IN1; open-drain outputs interface directly to CMOS µP reset/NMI pins. Use Value: Extends battery life >2 years in standby while guaranteeing reset assertion even if VCC sags to 1.2V during cold-start. |
Use Scenario: Medical infusion pump controller where failure to assert reset during power anomaly could cause unsafe delivery. IC Role / Device Role / Timing Role: Safety-critical supervisor with 2.93V VCC threshold, 0.62V PFI reference, and MR-connected pushbutton for user-initiated self-test. Use Value: Meets IEC 62304 Class C requirements via guaranteed 140ms minimum reset pulse and immunity to 100ns VCC transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6703MKA+ | 4.38V VCC reset threshold (M-suffix) vs. 2.93V (S-suffix); identical pinout, timing, and feature set | Designed for +5V systems instead of +3.3V; unsuitable for 3.3V/2.5V rail monitoring without external scaling | Select MAX6703MKA+ only when supervising nominal 5.0V supplies - verify VCC operating range matches system rail tolerance. |
| MAX6707AKA+ | Same 2.93V threshold and A-version watchdog behavior, but features open-drain PFO and RST_IN2 - adds third adjustable rail monitoring capability | Supports four-rail supervision (VCC + RST_IN1 + RST_IN2 + PFI) vs. three-rail (VCC + RST_IN1 + RST_IN2) in MAX6703ALKA+ | Choose MAX6707AKA+ when monitoring a fourth voltage (e.g., ADC reference) is required; otherwise MAX6703ALKA+ reduces BOM count. |
Compared with MAX6703MKA+, MAX6703ALKA+ enables tighter margin supervision of 3.3V rails without resistor scaling, while MAX6707AKA+ extends functionality to four-rail monitoring at same footprint - both retain identical watchdog deassertion logic and 140ms reset timeout.
Availability
MAX6703ALKA+ is available at Aetrix Electronics and suitable for white goods control, intelligent instrumentation, and critical µP power monitoring requiring stable component supply across extended temperature ranges (-40°C to +125°C) and long-lifecycle production programs.
Supply support for MAX6703ALKA+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, communications, and computing applications, emphasizing reliability, low power, and integration.
The MAX6701–MAX6708 family targets microprocessor supervision in space-constrained, multi-rail systems - delivering reset, watchdog, power-fail warning, and manual reset in a single 8-pin SOT23 device for cost-sensitive, high-reliability embedded control.
FAQ
What is the exact reset threshold voltage for MAX6703ALKA+?
The MAX6703ALKA+ has a factory-trimmed VCC reset threshold of 2.93V (typical), with ±3% tolerance over -40°C to +125°C. This value corresponds to the "S" suffix in the part number and is optimized for reliable supervision of +3.3V supply rails without external resistor networks.
Does MAX6703ALKA+ support monitoring three voltage rails simultaneously?
Yes, MAX6703ALKA+ monitors three rails: the primary VCC supply (2.93V threshold), plus two additional rails via RST_IN1 and RST_IN2 inputs. Each adjustable input references the internal 0.62V comparator threshold, enabling custom trip points using external resistor dividers per rail.
How does the watchdog behavior differ between MAX6703ALKA+ and non-A versions?
MAX6703ALKA+ deasserts WDO immediately when MR is pulled low or when VCC/RST_IN1/RST_IN2 recover - no timeout delay. Non-A versions require a WDI edge to clear WDO after timeout, creating potential latch-up if WDI is unconnected. This makes MAX6703ALKA+ safer for manual-reset-integrated watchdog recovery.
What is the function of the N.C. pin (Pin 6) on MAX6703ALKA+?
Pin 6 on MAX6703ALKA+ is a no-connect terminal - not internally bonded or electrically active. It must be left floating in PCB layout; tying it to GND or VCC is acceptable but provides no functional benefit and may risk mechanical stress on the bond wire.
Can MAX6703ALKA+ generate a reset pulse from a power-fail condition?
Yes - connect PFO to MR. When PFI voltage drops below 0.62V (indicating impending power loss), PFO goes low and pulls MR low, triggering a full reset pulse with 140ms duration. This enables orderly shutdown routines in µP firmware before VCC collapses.
MAX6703ALKA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 4.63V, Adj, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6703ALKA+ FAQ
1.How can I place an order for MAX6703ALKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703ALKA+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6703ALKA+ reliable?
The price and inventory of MAX6703ALKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703ALKA+ is usually 5 days.
3.What payment methods are accepted for MAX6703ALKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703ALKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703ALKA+?
MAX6703ALKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703ALKA+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6703ALKA+?
For technical support, including MAX6703ALKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703ALKA+ requirements.
6.How does Aetrix verify that MAX6703ALKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6703ALKA+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6703ALKA+ meets industry standards.
7.What is the process for return or replacement of MAX6703ALKA+?
All MAX6703ALKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703ALKA+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6703ALKA+ part is unused and in its original packaging.
Return procedure for MAX6703ALKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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